Hey, I had 3 sites with each 150.000 UV/day sending Adnetwork traffic. So I consider myself a "big" affiliate. I think Warez-BB gets paid on time because he is a "huge" affiliate. They can't afford to lose him.

I currently use Gunggo.com, like some other big sites out there. However, Gunggo doesn't have adverts for a majority of countries. So, you just don't earn cash on half those ads. In the case that they have no ads, they will just put a banner to their own site, effectively giving them a FREE backlink and free advertising.
You can't earn any 2nd tier money from them, so they have no affiliate code.

I also have a different advertiser that you might have seen on torrent sites before. It's basically one that pays you 30 USD/sale. You send in traffic from people that want to download something, and they get to see a billing page and if it bills then you get cash. They have been reliable for me and pay out on a NET-15 basis (bi-weekly).
http://www.affiliationprof.com